Quote:
Originally Posted by Daybreakbus
Putting in my Grey tank. Should my sink and shower drains be plummed together into the same line and then the tank, or can they have separate ports into the tank? Does it matter whether they're attached on the side or the top of the tank?
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To simplify the plumbing and to minimize holes in the tank, I suggest making a simple manifold for everything that drains into the grey tank, then a single 1.5" pipe into the tank. I ran my drain into the center of the top, so if the contents sloshed fore and aft while driving it wouldn't try to escape out the drain inlet. Run the drain lines so if the bus were not parked level the water would still drain correctly: I set my pipes to allow for the rear of the bus being up to 12" lower than the front. If you run the drain into the side of the tank, when the tank is full you may have grey water backing up into the drain pipe.
Don't forget to also adequately vent the grey tank, not just the black tank. Smells are caused by insufficient airflow through the tank(s): the aerobic bacteria there need oxygen to do their job and control smells, and I've never understood how a single vent pipe can allow airflow through a tank. For this reason I have two 2" vents in each tank's top, one to introduce fresh air and the other to let out air. When driving, air is forced through a front-facing louver and down into the poo tank, through that tank and then into the grey tank, through that tank and then sucked out by a venturi at ground level just ahead of the differential. This way any smells are sucked out well below where they could get back inside the bus; when parked the airflow is reversed, with cool air entering at ground level and exiting through the high louver due to natural convection. Easy!
John
Linear Mode
